天然气藏的破坏机理与保存条件评价——以莺山断陷为例

Destructive Mechanism of Gas Accumulation and Its Assessment of Preservative Conditions—An example of Yingshan fault depression.

构造变动、水动力冲刷和微渗漏是天然气藏破坏的三大机理类型。而构造变动中的盖层剥蚀和盖层破裂破坏最烈。莺山断陷深层天然气藏破坏严重,主要原因是断裂的活动。气藏破坏的实质是气藏中天然气的散失速度大于气源向气藏供气的速度。最后,给出了破坏单元、破坏强度和气藏保存条件评价模型,并应用该模型对莺山断陷深层气藏主要目的层的破坏单元进行了评价。

The easy destructive and difficult preservative properties tend to take a great risk for gas prospecting.Tectonic movement,hydraulic scouring and micro leakage become three important mechanics in destruction of a gas ac-cumulation,of which denudation and rupture in cap rock arisen by tectonic movement could be the most serious to its destruction.The serious destruction of deep gas accumulation in Yingshan fault depression is mainly resulted from the fault movement.The primary reason for its destruction is that dispersion lost velocity is greater than that of gas source supply into gas pool.This paper presented a model for assessment of destructive element,destructive intensity and preservative conditions of a gas accumulation.And the evaluation of the destructive element of major target zone in deep gas accumulation of Yingshan fault depression was made by using this model.